- 2006 Factory-verified
only in: EXT; the 2006 kit prints the code as "PNI" (an OCR form of PN1) and lists it in LT Package 1 (PDF); the service lists do not print it
GM Heritage factory kit — 2006 Chevrolet Trailblazer, p.166, p.170, p.194.
PN1 Factory-verified
Documented applications
This page aggregates every documented appearance of PN1 in the Chevrolet reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.